Troubleshooting Tip: FortiAnalyzer upgrade to 7.4.3, 7.4.5, 7.4.6 GUI shows a blue background color on the screen

After upgrading the FortiAnalyzer to 7.4.3, 7.4.5 or 7.4.6: the GUI shows a 'blue screen' after the user has logged in to the GUI.

1. After the upgrade, the FortiAnalyzer GUI presents the login page.

2. When the user credentials are entered, the login dialog goes away, leaving only the background image/color, by default a 'blue screen' with the Mariner theme background.

The color depends on the background of the theme assigned to user authenticating, i.e. 'green screen' to Jade theme.

3. When trying to change the browser URL (such as using /ui/login as a workaround), the browser only shows a blank page.

The issue occurs with users using a custom profile (system admin profile). The user 'admin' with a 'Super_User' profile is not set up.

This issue was reported as Bug ID 1098690 and was fixed in 7.4.7 and v7.6.3.

Workaround:

1. Clear the session_id of the user authenticated.

diagnose system admin-session list <----- Shows all current administrator login sessions on the FortiGate device.

diagnose system admin-session kill <session_id> <----- Used to forcefully log out (terminate) a specific admin session using its session ID.

2. Reboot FortiAnalyzer using the command 'exe reboot'.
   
   
3. Delete and recreate the custom profile and assign it to the user.

Related article:
Technical Tip: How to debug GUI issues in FortiManager/FortiAnalyzer